Otto Kruger

Dr. Stendahl

Vicky Lane

Paula Dupree - the Ape Woman

Amelita Ward

Ann Forrester

Phil Brown

Don Young

Jerome Cowan

Detective W.L. Harrigan

Rondo Hatton

Moloch the Brute

Eddie Acuff

Bill

Ernie Adams

Jim

Charles Wagenheim

Fred

Eddy Chandler

Motorcycle Cop

Jack Overman

Detective - George

Pat Gleason

Tom - Second Morgue Attendant (uncredited)

William Murphy

Johnny - Errand Boy (uncredited)

Bob Pepper

Policeman at Morgue (uncredited)

Harold Young